Correct

栽跟头

/ zāigēntou /
Strokes

Definition

to fall head over heels/(fig.) to come a cropper

Example

As a Verb

tumble; fall headfirst

1
jiǎoxià
脚下
huá
  
,
zāi
le
gēntou
跟头
  

I slipped and fell.

As a Verb

come to grief; come a cropper; suffer a setback; make a fool of oneself

2
Tóu
投资
shì
xiàng
fēngxiǎn
风险
shì
事业
  
,
jiùshì
就是
xiē
那些
dǒngháng
懂行
de
rén
yǒushí
有时
huì
zāigēntou
栽跟头
  

Investment is a hazardous business; even those who are in the swim sometimes come a cropper.

3
gāngyòng
刚愎自用
  
,
tīng
quàngào
劝告
  
,
jiēguǒ
结果
zāi
le
gēntou
跟头
  

His perverse refusal to take any advice resulted in an awful blunder.